Add more checklists to PR template

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,9 +1,3 @@
-<!--
-    Pull request template based on the following templates:
-    * https://raw.githubusercontent.com/ionic-team/ionic/master/.github/PULL_REQUEST_TEMPLATE.md
-    * https://raw.githubusercontent.com/appium/appium/master/.github/PULL_REQUEST_TEMPLATE.md
--->
-
 ## Proposed changes
 
 Describe the big picture of your changes here to communicate to the maintainers
@@ -14,6 +8,7 @@ request, be sure to link to that issue.
 
 Please check the type of change your PR introduces:
 
+- [ ] Release (new release request)
 - [ ] Bugfix (non-breaking change which fixes an issue)
 - [ ] New feature (non-breaking change which adds functionality)
 - [ ] Code style update (PEP8, lint, formatting, renaming, etc)
@@ -31,6 +26,7 @@ your code._
 
 - [ ] Lint and unit tests pass locally with my changes
 - [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] I have added documentation to https://github.com/python-social-auth/social-docs
 
 ## Other information